This will display the block/turret menu while held down

This will allow you to select a specific block

Rotate Camera around object

Focus on the selected block

Attempt to undo

Attemp to redo

All scale slow, drag mouse

Rotate block. Rotation model will appear over the block

All scale fast, drag mouse

Length scale, drag mouse

Width scale, drag mouse

Height scale, drag mouse

Select color

Mirror Flip/Rescale block. Useful for corners and triangles